defmodule Dynamic.Macros do
	defmacro get(funs) when is_list(funs) do
		funs
		|> Enum.map(fn fun ->
			quote do
				get(unquote(fun))
			end
		end)
	end

	defmacro get(fun) do
		quote do
			get(unquote(fun), Atom.to_string(unquote(fun)))
		end
	end

	defmacro get(fun, cb) when is_function(cb) do
		quote do
			get(unquote(fun), Atom.to_string(unquote(fun)), unquote(cb))
		end
	end

	defmacro get(fun, path) do
		quote do
			get(unquote(fun), unquote(path), &(&1))
		end
	end

	defmacro get(fun, path, cb) when is_list(path) === false do
		quote do
			get(unquote(fun), [unquote(path)], unquote(cb))
		end
	end

	defmacro get(fun, path, cb) do
		quote do
			def unquote(fun)(input) do
				result =
					input
					|> Dynamic.get(unquote(path))
				unquote(cb).(result)
			end
		end
	end

	defmacro __using__(_opts) do
		quote do
			import Dynamic.Macros

			def pull(input, fields) do
				fields
				|> Enum.map(&apply(__MODULE__, &1, [input]))
			end
		end
	end
end

defmodule Dynamic.Example do
	use Dynamic.Macros

	get :key
	get :nice

	@sample %{"key" => "key", "nice" => "nice"}

	def test do
		[key, nice] = Dynamic.Example.pull(@sample, [:key, :nice])
	end

end